Ace Kannada actor Chandrashekhar passes away in Canada

Bengaluru, May 30: Karnataka Chief Minister BS Yediyurappa has announced that on May 31 (Sunday) there will not be a total lockdown and all activities will be permitted and continue like the rest of the week.

The decision was taken in view of demands from citizens and “keeping their interests in mind,” said a statement from the Chief Minister’s Office (CMO).

This means that public transport services - buses, autos and cabs - shops, commercial establishments and others will be open on May 31.

Under a Lockdown 4.0, Karnataka had decided to throw open public transport, except metro, shops and commercial establishments, except Metro, on all six days between 7 am and 7 pm. However, May 24 and May 31 - Sundays - were exempted from the relaxation and a curfew was to be imposed throughout the day.

The Lockdown 4.0 ends May 31 and the government's decision to keep Sunday free comes ahead of the Lockdown 5.0 that the Centre is expected to announce soon.

Karnataka on Saturday reported 12 new cases, the highest in a single day so far, taking the tally in the state to 76.

Late at night, the Mysuru district commissioner said five more people had tested positive in the district. But it was yet to be confirmed by the state health department.

Of the cases, 41 are from Bengaluru, eight from Chikkaballapur, while Uttara Kannada and Dakshina Kannada districts have seven each.

Interestingly, the highest number of patients are those from Dubai or those who had transit travel via Dubai. Out of 76 cases, 17 cases (22%) have travel history to Dubai, the capital of Emirate of Dubai and the most populous city in the United Arab Emirates (UAE).

Medical Education Minister Dr K Sudhakar, who is also in-charge of COVID-19 operations, said that Dubai has been a major concern as far as Karnataka COVID-19 patients are concerned. “Most of the positive cases have come through Dubai suggesting something amiss there,” he said. 

Echoing the same, Dr Prakash Kumar, Joint Director, Communicable Diseases, Department of Health and Family Welfare, said, “The layover in Dubai is around six to seven hours. We are seeing Dubai to be the new epicentre of the virus as far as India is concerned.”

UAE was initially not on the list of countries from where passengers were screened. It was added much later when clusters of patients with travel history to Dubai began popping up all over the country.

Patient-19 has infected the maximum so far.

Out of the 12 cases that tested positive on Saturday, five are contacts of Patient 19. All of them are being treated at a Chikkaballapur hospital. Two of them are from Hindupur, Andhra Pradesh, and three are residents of Gauribidanur taluk in Chikkabalapur district.

P19, a 31-year-old man from Chikkaballapur, had travelled to Mecca, Saudi Arabia, and returned to India on March 14. Existing patient clusters suggest that P19 had infected the maximum number of people. Officials did not reveal how many people he originally travelled with to Mecca.

Amid the rise in cases, Jawaid Akhtar, Additional Chief Secretary (Health), maintained that the state had not reached stage 3. But he had no definitive answer as to how the Mysuru patient contracted the virus despite health officials he was in touch with not testing positive.

Health Commissioner Pankaj Kumar Pandey said around 1,000 primary contacts of all positive cases have been classified as high-risk and low-risk. The high-risk patients are in government hospitals while the low-risk ones in quarantine facilities.

The current physical distancing guidelines provided by the World Health Organisation (WHO) and by the US Centers for Disease Control and Prevention (CDC) may not be adequate to curb the coronavirus spread, according to a research which says the gas cloud from a cough or sneeze may help virus particles travel up to 8 metres. The research, published in the Journal of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.

Study author, MIT associate professor Lydia Bourouiba, warned that droplets of all sizes can travel 23 to 27 feet, or 7-8 metres, carrying the pathogen.

According to Bourouiba, the current guidelines are based on "arbitrary" assumptions of droplet size, "overly simplified", and "may limit the effectiveness of the proposed interventions" against the deadly pandemic.

 She explained that the old guidelines assume droplets to be one of two categories, small or large, taking short-range semi-ballistic trajectories when a person exhales, coughs, or sneezes.

However based on more recent discoveries, the MIT scientist said, sneezes and coughs are made of a puff cloud that carries ambient air, transporting within it clusters of droplets of a wide range of sizes.

Bourouiba warned that this puff cloud, with ambient air entrapped in it, can offer the droplets moisture and warmth that can prevent it from evaporation in the outer environment.

"The locally moist and warm atmosphere within the turbulent gas cloud allows the contained droplets to evade evaporation for much longer than occurs with isolated droplets," she said.

"Under these conditions, the lifetime of a droplet could be considerably extended by a factor of up to 1000, from a fraction of a second to minutes," the researcher explained in the study.

The MIT scientist, who has researched the dynamics of coughs and sneezes for years, added that these droplets settle along the trajectory of a cough or sneeze contaminating surfaces, with their residues staying suspended in the air for hours.

"Even when maximum containment policies were enforced, the rapid international spread of COVID-19 suggests that using arbitrary droplet size cutoffs may not accurately reflect what actually occurs with respiratory emissions, possibly contributing to the ineffectiveness of some procedures used to limit the spread of respiratory disease," Bourouiba wrote in the study